Mr. Keunhwa Park Profile

Keunhwa Park

at 230, Junggye-ro, Nowon-gu

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Author

Publications (2)

Proceedings Article | 4 April 2022 Poster + Paper

Development of 120 kV CNT-based digital x-ray tube for fluoroscopy

Amar Prasad Gupta, Jaekyu Jang, Keunhwa Park, Hanna Lee, Deokwon Seo, Mrinal Bhusal Sharma, Jaeik Jung, YoungKuk Park, Seung Jun Yeo, Jeung Sun Ahn, Jehwang Ryu

Proceedings Volume 12031, 1203147 (2022) https://doi.org/10.1117/12.2613554

KEYWORDS: Carbon nanotubes, X-rays, X-ray imaging, Fluoroscopy, Ceramics, Skull, Digital x-ray imaging, X-ray sources, X-ray fluorescence spectroscopy, X-ray characterization, Switching

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Proceedings Article | 4 April 2022 Poster + Paper

Development of 120 kV ceramic x-ray tube for dental imaging and its comparison with commercial glass x-ray tube

Jaekyu Jang, Amar Prasad Gupta, Keunhwa Park, Jinho Choi, Hanna Lee, Mrinal Bhusal Sharma, Deokwon Seo, Jaeik Jung, Seung Jun Yeo, Jeung Sun Ahn, Jehwang Ryu

Proceedings Volume 12031, 120314D (2022) https://doi.org/10.1117/12.2613461

KEYWORDS: X-rays, Ceramics, X-ray imaging, Glasses, Panoramic photography, Tungsten, Image resolution, X-ray detectors, X-ray characterization, Spatial resolution

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When designing an X-ray monoblock for portable systems, the size and compactness of X-ray tube plays an important role. The monoblocks normally contains high voltage unit and X-ray tube immersed together inside the sea of insulating oil and sealed by Aluminum or plastic frame. Normally, mononblocks built for 100 kV or higher X-ray tube are quite bulky, not because of the high voltage source unit but because of the huge size of glass enveloped X-ray tube. The compactness of X-ray tube can decrease the size of mononblock and it can subsequently increase the portability of X-ray system. There are efforts done to decrease the size of X-ray tube by replacing the glass envelope with metal ceramic frames in CT X-ray tubes which are categorized as Rotating X-ray tubes. However, there are few or almost no researches on looking for an alternative to avoid making bulky glass X-ray tubes for Stationary tubes. It might be partially because the discovery of Xray tubes is all connected to the glass vacuum tubes. Other reasons could be due to matureness of glass making technology, which though still lacks automation but is cheaper and easier. Our group has realized that using ceramic to maintain vacuum and use it as an alternative to glass envelop can increase the robustness and compactness of filament X-ray tubes. Moreover, it can also help engineers to develop smaller and lighter monoblock for high-end X-ray systems. Thus, in this study, we report a development of compact 120 kV ceramic-based filament type X-ray tube for panoramic dental imaging. We have compared in-house built ceramic X-ray tube with commercial glass X-ray tube which is most commonly used for 100 kV panoramic dental X-ray imaging system. The result shows that despite the 38 % reduction in size, ceramic tube has better IV characteristic with similar filament size and higher limiting spatial resolution compared to glass X-ray tube. Moreover, we have successfully performed all the X-ray experiments using 100 kV 500W custom built high voltage source which can be used for making monoblocks.

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